HELP - update firmware hp2500c failed

What do i have to do, i updated the firmware for the hp 2500c, but this process failed during the installation proces!! I can't get connection to the printer to update the firmware again, it seems that the printer is messed up now...... Even a manual update doesn't work anymore, it seems that the printer doesn't recognise the ports. When i turn on the printer, two leds are flashing and that's it.......messed up.... HELP!!